What structural attribute makes the Whippet notoriously sensitive to cold weather?

Answer

Lacking the insulating undercoat found in many other breeds

The Whippet's coat is intentionally fine, short, and smooth, lying close to the body. This feature is directly functional, as it enhances their aerodynamic efficiency by reducing friction and drag during high-speed pursuits, fitting their racing heritage. However, this very sleek covering comes at a thermal cost. Unlike many other dog breeds that possess a dense, insulating undercoat for protection against harsh temperatures, the Whippet lacks this layer. Consequently, they are highly sensitive to cold environments. This means that even moderately chilly conditions, such as an autumn evening, require the owner to provide supplemental warmth via a coat or sweater to prevent chilling during walks.

What structural attribute makes the Whippet notoriously sensitive to cold weather?

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